<form action="<?php echo url_for('blog_search') ?>" method="post">
  <fieldset>
    <div>
      <?php echo $form['title']->renderLabel(__('Search')) ?>
      <?php echo $form['title']->render(array('class' => 'keywords')) ?>
      <input name="submit" value="<?php echo __('find') ?>" class="button" type="submit"/>
    </div>
  </fieldset>
</form>